Inhibition of some aquatic and aromatic plants extracts on fungal infection on common carp (Cyprinus carpio L.) and its eggs

Abstract

Present study was carried out to investigate the inhibition effect of extracts of some aquatic and aromatic plants on three fungi genera (Aspergillus, Penicillium and Saprolegnia) infecting common carp and its eggs. The inhibition test was done for 15 species of plants represented: Hornwort Ceratophyllum demersum L.; Water hyssop Bacopamonnieria (L.) Hayata et Mastum; Eurasian watermilfoil Myriophyllum spicatumL.; curled pondweed Potamogeton crispus L.; Widgeon-grass Ruppia maritimaL.; Mint Mentha spicata L.; Ginger Zingiber officinale Roscoe; Onion Allium cepa L.; Leek Allium ampeloprasum L. var. porrum (L.) ;Damas Conocarpus lancifolius Engl. & Diels; Garden cress Lepidium sativum L.; Brant's oak Quercus brantii Lindl. and Eggplant Solanum melongena L. using the manner of food poisoning in Petri dishes. The results showed a difference in the inhibitory effect of the extracts according to the species of plants and fungi. The highest percentage of inhibition on Aspergillus was by using Q. brantii (79%) and the lowest was the R. maritime (18%). The highest percentage of inhibition on Penicillium was obtained by using the water extract of Z. officinale (81%) and lowest was the S. melongena (2%). M. spicatum extract has the highest inhibitory effect on Saprolegnia (100%) while the lowest was A. sativum (38.8%).